Sidelink transmission method and terminal

ABSTRACT

The present application relates to a sidelink transmission method and a terminal. The method includes: a terminal receives downlink information, the downlink information being used to indicate the resource authorization of a sidelink; and the terminal controls, on the basis of a first event, the state of a timer related to discontinuous reception (DRX) for the sidelink.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of International Patent ApplicationNo. PCT/CN2020/121318 filed on Oct. 15, 2020. The entire content of theprior application is incorporated by reference herein in its entirety.

BACKGROUND

Device to Device (D2D) communication is a transmission technology basedon sidelink (SL). Unlike manners in which communication data in aconventional cellular system is received or transmitted by a basestation, a Vehicle to Everything (V2X) system uses aterminal-to-terminal direct communication manner, and thus has higherspectral efficiency and lower transmission delay.

In a long-term evolution (LTE) system, Discontinuous Reception (DRX) isan energy-saving mechanism. In sidelink transmission, a problem whichneeds to be considered is how to optimize the DRX to reduce energyconsumption of a terminal.

SUMMARY

The disclosure relate to the technical field of communication, and moreparticularly, to a sidelink transmission method and a terminal.

An embodiment of the disclosure provides a sidelink transmission method,which includes the following operations.

A terminal receives downlink information. The downlink information isconfigured to indicate resource grant of a sidelink.

The terminal controls a state of a timer related to DRX for the sidelinkbased on a first event.

An embodiment of the disclosure provides a terminal, including areception unit and a processing unit.

The reception unit is configured to receive downlink information. Thedownlink information is configured to indicate resource grant of asidelink.

The processing unit is configured to control a state of a timer relatedto DRX for the sidelink based on a first event.

An embodiment of the disclosure provides a terminal, which includes aprocessor and a memory. The memory is configured to store a computerprogram, and the processor is configured to call and run the computerprogram stored in the memory to enable the terminal device to executethe above sidelink transmission method.

An embodiment of the disclosure provides a chip configured to implementthe above sidelink transmission method.

Specifically, the chip includes a processor configured to call and run acomputer program from a memory to enable a device installed with thechip to execute the above sidelink transmission method.

An embodiment of the disclosure provides a computer-readable storagemedium which is configured to store a computer program. The computerprogram enables a device to execute the above sidelink transmissionmethod when executed by the device.

An embodiment of the disclosure provides a computer program productwhich includes a computer program instruction. The computer programinstruction enables a computer to execute the above sidelinktransmission method.

An embodiment of the disclosure provides a computer program, whichenables a computer to execute the above sidelink transmission methodwhen executed on the computer.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of an application scenario according to anembodiment of the disclosure.

FIG. 2 is a diagram of a mode-A.

FIG. 3 is a diagram of a mode-B.

FIG. 4 is a flowchart of a sidelink transmission method according to anembodiment of the disclosure.

FIG. 5 is a diagram of a first example.

FIG. 6 is a diagram of a second example.

FIG. 7 is a diagram of a third example.

FIG. 8 is a diagram of a fourth example.

FIG. 9 is a block diagram of a terminal according to an embodiment ofthe disclosure.

FIG. 10 is a block diagram of a communication device according to anembodiment of the disclosure.

FIG. 11 is a block diagram of a chip according to an embodiment of thedisclosure.

FIG. 12 is a block diagram of a communication system according to anembodiment of the disclosure.

DETAILED DESCRIPTION

Technical solutions in the embodiments of the disclosure would bedescribed below in combination with the drawings in the embodiments ofthe disclosure.

The embodiments of the disclosure may be applied to variouscommunication systems, such as a Global System of Mobile communication(GSM) system, a Code Division Multiple Access (CDMA) system, a WidebandCode Division Multiple Access (WCDMA) system, a General Packet RadioService (GPRS), a Long Term Evolution (LTE) system, an Advanced longterm evolution (LTE-A) system, a New Radio (NR) system, an evolutionsystem of NR system, a LTE-based access to unlicensed spectrum (LTE-U)system, a NR-based access to unlicensed spectrum (NR-U) system, aNon-Terrestrial Network (NTN) system, a Universal MobileTelecommunication System (UMTS), a Wireless Local Area Network (WLAN), aWireless Fidelity (WiFi), a 5th-Generation communication (5G) system, oranother communication system, or the like.

Generally speaking, a limited number of connections are supported by aconventional communication system, and are also easy to be implemented.However, with the development of communication technologies, a mobilecommunication system may not only support conventional communication,but also support communication such as D2D communication, Machine toMachine (M2M) communication, Machine Type Communication (MTC), Vehicleto Vehicle (V2V) communication, or V2X communication, or the like, andthe embodiments of the disclosure may also be applied to thesecommunication systems.

Optionally, the communication system in the embodiments of thedisclosure may be applied to a Carrier Aggregation (CA) scenario, or maybe applied to a Dual Connectivity (DC) scenario, or may be applied to astandalone (SA) networking scenario.

Optionally, the communication system in the embodiments of thedisclosure may be applied to an unlicensed spectrum. The unlicensedspectrum may also be considered to be a shared spectrum. Alternatively,the communication system in the embodiments of the disclosure may alsobe applied to a licensed spectrum. The licensed spectrum may also beconsidered to be a non-shared spectrum.

The embodiments of the disclosure describe various embodiments incombination with a network device and a terminal device. The terminaldevice may also be referred to as a User Equipment (UE), an accessterminal, a user unit, a user station, a mobile station, a mobileplatform, a remote station, a remote terminal, a mobile device, a userterminal, a terminal, a wireless communication device, a user agent, ora user device, or the like.

The terminal device may be a STAION (ST) in WLAN, or may be a cellularphone, a cordless phone, a Session Initiation Protocol (SIP) phone, aWireless Local Loop (WLL) station, a Personal Digital Assistant (PDA)device, a handheld device with a wireless communication function, acomputing device or other processing devices connected to a wirelessmodem, a vehicle-mounted device, a wearable device, a terminal device ina next-generation communication system such as an NR network, or aterminal device in a future-evolved Public Land Mobile Network (PLMN)network, or the like.

In the embodiments of the disclosure, the terminal device may bedeployed on land, including indoor or outdoor, handheld, wearable, orvehicle-mounted; or may be deployed on a water surface (such as a ship);or may be deployed in the air (such as an aircraft, a balloon, asatellite, or the like).

In the embodiments of the disclosure, the terminal device may be amobile phone, a tablet computer (Pad), a computer with a wirelesstransceiving function, a Virtual Reality (VR) terminal device, anAugmented Reality (AR) terminal device, a wireless terminal device inindustrial control, a wireless terminal device in self driving, awireless terminal device in remote medical, a wireless terminal devicein smart grid, a wireless terminal device in transportation safety, awireless terminal device in smart city, or a wireless terminal device insmart home, or the like.

As an example rather than limitation, in the embodiments of thedisclosure, the terminal device may also be a wearable device. Thewearable device may also be referred to as a wearable smart device,which is a general term of wearable devices developed by applying awearable technology to intelligently design daily wearable objects, suchas glasses, gloves, watches, clothing, shoes, or the like. The wearabledevice is directly worn on the body, or is a portable device integratedinto a user’s clothing or accessory. The wearable device is not only ahardware device, but also achieves powerful functions through softwaresupport, data interaction and cloud interaction. A generalized wearablesmart device has full functions and a large size, and may not rely on asmart phone to implement full or part of the functions, such as a smartwatch, or smart glasses, or the like; or only focus on a certain type ofapplication function, and needs to be used in cooperation with otherdevices such as a smart phone, such as various kinds of smart bracelets,smart jewelry, or the like, for monitoring physical signs.

In the embodiments of the disclosure, the network device may be a devicecommunicating with a mobile device. The network device may be an AccessPoint (AP) in WLAN, a Base Transceiver Station (BTS) in GSM or CDMA, ora NodeB (NB) in WCDMA, or an Evolutional Node B (eNB or eNodeB) in LTE,or a relay station or AP, or a network device (gNB) in a vehicle-mounteddevice, a wearable device and an NR network, or a network device in afuture-evolved PLMN network, or a network device in an NTN network, orthe like.

As an example rather than limitation, in the embodiments of thedisclosure, the network device may have a mobility characteristic, forexample, the network device may be a mobile device. Optionally, thenetwork device may be a satellite or a balloon station. For example, thesatellite may be a Low Earth Orbit (LEO) satellite, a Medium Earth Orbit(MEO) satellite, a Geostationary Earth Orbit (GEO) satellite, a HighElliptical Orbit (HEO) satellite, or the like. Optionally, the networkdevice may also be a base station arranged at a position such as land orwater area, or other positions.

In the embodiments of the disclosure, the network device may provideservices for a cell, and the terminal device may communicate with thenetwork device through transmission resources (such as frequency domainresources or spectrum resources) used by the cell. The cell may be acell corresponding to the network device (such as a base station), andthe cell may belong to a macro base station, or may belong to a basestation corresponding to a small cell. The small cell may include ametro cell, a micro cell, a pico cell, a femto cell, or the like. Thesmall cells have characteristics of small coverage and low transmissionpower, and are suitable for providing high-rate data transmissionservices.

FIG. 1 exemplarily shows a communication system 100, which includes anetwork device 110 and two terminal devices 120. Optionally, thecommunication system 100 may include multiple network devices 110, andother numbers of terminal devices 120 may be included within arespective coverage of each of the network devices 110, which are notlimited in the embodiments of the disclosure.

Optionally, the communication system 100 may further include othernetwork entities such as a Mobility Management Entity (MME), an Accessand Mobility Management Function (AMF), or the like, which are notlimited in the embodiments of the disclosure.

The network device may further include an access network device and acore network device. That is, a wireless communication system mayfurther include multiple core networks communicating with the accessnetwork device. The access network device may be an eNB or e-NodeB, amacro base station, a micro base station (also referred to as a “smallbase station”), a pico base station, an AP, a transmission point (TP),or a new generation Node B (gNodeB) in a LTE system, a Next Radio (NR)system or an Authorized Auxiliary Access Long-Term Evolution (LAA-LTE)system, or the like.

It should be understood that in the embodiments of the disclosure, adevice with a communication function in a network/system may be referredto as a communication device. Taking the communication systemillustrated in FIG. 1 as an example, the communication device mayinclude a network device and a terminal device of which each has acommunication function. Each of the network device and the terminaldevice may be a specific device in the embodiments of the disclosure,and is not elaborated here. The communication device may further includeother devices in the communication system, such as a network controller,a MME or other network entities, which are not limited in theembodiments of the disclosure.

It should be understood that terms “system” and “network” in thedisclosure may usually be used interchangeably. In the disclosure, term“and/or” refers to only an association relationship for describingassociated objects and represents that three relationships may exist.For example, A and/or B may represent three cases: i.e., only A exists,both A and B exist, and only B exists. Furthermore, character “/” in thedisclosure usually represents that previous and next associated objectsform an “or” relationship.

It should be understood that “indication” mentioned in the embodimentsof the disclosure may be a direct indication, or may be an indirectindication, or may be represented as having an association relationship.For example, A indicates B, which may indicate that A directly indicatesB, for example, B may be obtained by A; or may indicate that Aindirectly indicates B, for example, A indicates C, and B may beobtained by C; or may indicate that A and B have an associationrelationship there-between.

In descriptions of the embodiments of the disclosure, term“corresponding” may indicate that there are direct or indirectcorrespondences between two objects, or may indicate that the twoobjects have an association relationship there-between, or may have anindicating and indicated relationship, a configuring and configuredrelationship, or the like.

In order to facilitate understanding the technical solutions of theembodiments of the disclosure, related technologies of the embodimentsof the disclosure are described below. The following relatedtechnologies may be used as optional solutions, and may be arbitrarilycombined with the technical solutions of the embodiments of thedisclosure, which belong to a scope of protection of the embodiments ofthe disclosure.

As illustrated in FIG. 2 and FIG. 3 , the 3rd Generation PartnershipProject (3GPP) includes the following transmission modes: mode-A andmode-B.

Mode-A: transmission resources of a terminal are allocated by a basestation, and the terminal transmits data on a sidelink according toresources allocated by the base station. The base station may allocateresources for single transmission to the terminal, or may allocateresources for semi-static transmission to the terminal.

Mode-B: the terminal device selects a resource from a resource pool totransmit data, and the terminal device may be a vehicle-mounted terminalin V2X.

In an evolution process of 3GPP protocol, D2D may include the followingscenarios:

Proximity based Service (ProSe): D2D communication in Rel-12/13 mainlyaims at a ProSe scenario, and is applicable to services of publicsecurity types.

V2X: in Rel-14/15, a V2X system mainly aims at a V2V communicationscenario, and mainly faces services of communication between vehiclesmoving at relatively high-speeds, and communication between the vehiclesand persons.

Wearable device (FeD2D): in Rel-14, FeD2D mainly aims at a scenariowhere a wearable device accesses a network through a mobile phone, andmainly faces scenarios of low moving speed and low power access.

Based on LTE V2X, NR V2X is not limited to a broadcast scenario, and isfurther expanded to unicast and multicast scenarios. Application of V2Xis studied in these scenarios.

Similar to LTE V2X, NR V2X also defines two resource grant modes, i.e.,the above-mentioned mode-A and mode-B. Furthermore, a user may be in amixed mode, that is, the user may not only use the mode-A to obtainresources, but also use the mode-B to obtain resources.

Unlike LTE V2X, in addition to Hybrid Automatic Repeat reQuest (HARQ)retransmission without feedback and initiated by UE autonomously, NR V2Xintroduces feedback-based HARQ retransmission, which is not limited tounicast communication, and also includes multicast communication.

DRX is introduced as follows.

A user needs to perform DRX during downlink reception to save power.Considering that a network may transmit resource grant for a sidelink tothe user through downlink (that is, by way of the mode-A), a problemexisted here is how to perform DRX during downlink reception withrespect to the “resource grant for a sidelink”.

In LTE, a UE may be configured as the mode-A and use the DRXsimultaneously. However, the network does not specifically optimize theDRX with respect to the “resource grant for a sidelink”. That is, the UEmay determine whether to enter sleep for power saving according to Uuinterface rather than parameters/timers related to the sidelink, or thelike. In NR, UE cannot be configured as the mode-A and use the DRXsimultaneously at present.

The disclosure may be applied to the NR. In a scenario where the UE canbe configured as the mode-A and use the DRX simultaneously, the DRX isspecifically optimized with respect to the “resource grant for asidelink”, and parameters and timers related to the DRX with respect tothe “resource grant for a sidelink” are proposed.

FIG. 4 is a flowchart of a sidelink transmission method 200 according toan embodiment of the disclosure. The method may be optionally applied tothe system illustrated in FIG. 1 to FIG. 3 , but is not limited thereto.The method includes at least part of the following contents.

At S210, a terminal receives downlink information. The downlinkinformation is configured to indicate resource grant of a sidelink.

At S220, the terminal controls a state of a timer related to DRX for thesidelink based on a first event.

Optionally, in the embodiment of the disclosure, the downlinkinformation is carried by a Physical Downlink Control Channel (PDCCH).

Optionally, in the embodiment of the disclosure, the timer related tothe DRX comprises at least one of a round-trip time (RTT) timer or aretransmission timer.

Optionally, in the embodiment of the disclosure, the state of the timerrelated to the DRX for the sidelink is controlled, which may include atleast one of the following operations.

The RTT timer for the sidelink is started.

In response to expiration of the RTT timer, a retransmission timer forthe sidelink is started.

For example, in a case that the timer related to the DRX includes theRTT timer for the sidelink and the retransmission timer for thesidelink, the terminal may start the RTT timer for the sidelink based onthe first event. In response to the expiration of the RTT timer, theterminal may start the retransmission timer for the sidelink.

Optionally, in the embodiment of the disclosure, the state of the timerrelated to the DRX for the sidelink is controlled, which may include thefollowing operation.

A retransmission timer for the sidelink is started.

For example, in a case that the timer related to the DRX includes theretransmission timer for the sidelink, the terminal may start theretransmission timer for the sidelink based on the first event.

Optionally, in the embodiment of the disclosure, the state of the timerrelated to the DRX for the sidelink is controlled, which may furtherinclude the following operation:

A running retransmission timer for the sidelink is stopped.

For example, transmission of the sidelink may be continuous. In a casethat there is a retransmission timer running in the sidelink, theterminal may stop the running retransmission timer based on the firstevent. Then, a RTT timer for the sidelink is started. In response to theexpiration of the RTT timer, the retransmission timer for the sidelinkis started.

For another example, in a case that there is no RTT timer for thesidelink, the terminal may restart the retransmission timer for thesidelink based on the first event.

In the embodiment of the disclosure, after the terminal starts theretransmission timer for the sidelink, the terminal is in a wake-upstate of DRX and may monitor a downlink channel during operation of theretransmission timer. For example, the terminal performs downlink PDCCHreception for a specific HARQ process of the sidelink. After theterminal obtains the resource grant for the sidelink allocated by thenetwork to the terminal, the terminal may perform sidelink communicationwith other terminals of the sidelink based on the resource grant for thesidelink. In case that the retransmission timer for the sidelink is notstarted, the terminal is in a sleep state of DRX and may not monitor thedownlink channel, thereby achieving energy saving and power savingeffects.

In the embodiment of the disclosure, after the terminal starts the RTTtimer for the sidelink, the terminal does not need to monitor thedownlink channel during operation of the timer. For example, during theoperation of the RTT timer, the terminal does not need to performdownlink PDCCH reception, or does not need to perform the downlink PDCCHreception for a specific HARQ process of the sidelink.

Optionally, in the embodiment of the disclosure, the method may furtherinclude the following operation.

The terminal determines whether to start the retransmission timer forthe sidelink based on feedback information.

Optionally, in the embodiment of the disclosure, the terminal determineswhether to start the retransmission timer for the sidelink based on thefeedback information, which may include at least one of the followingoperations.

The retransmission timer for the sidelink is not started, in response tothe feedback information being acknowledgement (ACK) information.

The retransmission timer for the sidelink is started, in response to thefeedback information being non-acknowledgement (NACK) information.

The retransmission timer for the sidelink is started, in response toreception of the feedback information.

The retransmission timer for the sidelink is not started, in response tono reception of the feedback information.

For example, the terminal may determine whether to start theretransmission timer for the sidelink based on a transmission situationof a peer side represented by the received feedback information. Thefeedback information received by the terminal is the ACK information,which may indicate that the peer side successfully receives data fromthe terminal, and the retransmission timer for the sidelink may not bestarted. The feedback information received by the terminal is the NACKinformation, which may indicate that the peer side does not successfullyreceive the data from the terminal, and the retransmission timer for thesidelink may be started.

For another example, the terminal may determine whether to start theretransmission timer for the sidelink based on whether the feedbackinformation is received. The terminal does not receive the feedbackinformation from the peer side, which may indicate that the peer sidesuccessfully receives the data from the terminal or the peer side doesnot need the retransmission, and the retransmission timer for thesidelink may not be started. The terminal receives the feedbackinformation, which may indicate that the peer side does not successfullyreceive the data from the terminal or the peer side needs theretransmission, and the retransmission timer for the sidelink may bestarted.

Optionally, in the embodiment of the disclosure, the first event mayinclude the following.

The terminal receives downlink resources including the downlinkinformation. The downlink resources may be a control channel or a datachannel, such as a PDCCH or a Physical Downlink Shared Channel (PDSCH).

Optionally, the first event may include: when the terminal receives thedownlink resources including the downlink information.

For example, the retransmission timer for the sidelink may be startedwhen the terminal receives the PDCCH. For another example, the RTT timerfor the sidelink may be started when the terminal receives the PDCCH,and the retransmission timer for the sidelink may be started in responseto the expiration of the RTT timer.

Optionally, the first event may include: after the terminal receives thedownlink resources including the downlink information, which means thatthe first event does not occur along with reception of the downlinkresources, instead, there is a certain interval in time sequencethere-between. Exemplarily, the first event occurs at a first time unitor a specific number of time units after the terminal receives thedownlink resources including the downlink information. For example, at anext slot, a next symbol, or a predetermined number of slots or symbolsin time sequence after receiving the downlink resources, the first eventmay control the state of the timer related to the DRX for the sidelink.

For example, the retransmission timer for the sidelink may be startedafter the terminal receives the PDCCH. For another example, the RTTtimer for the sidelink may be started after terminal receives the PDCCH,and the retransmission timer for the sidelink may be started in responseto the expiration of the RTT timer.

Optionally, in the embodiment of the disclosure, the first event mayinclude the following.

The terminal transmits at least one of a Physical Sidelink ControlChannel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH).

Exemplarily, the first event may only include that the terminaltransmits at least one of the PSCCH or the PSSCH. The first event mayalso include that the terminal receives the PDCCH, and that the terminaltransmits at least one of the PSCCH or the PSSCH.

Optionally, the first event may include: when the terminal transmits atleast one of the PSCCH or the PSSCH.

For example, the retransmission timer for the sidelink may be startedwhen the terminal transmits at least one of the PSCCH or the PSSCH.

For another example, the RTT timer for the sidelink may be started whenthe terminal transmits at least one of the PSCCH or the PSSCH, and theretransmission timer for the sidelink may be started in response to theexpiration of the RTT timer.

For another example, the RTT timer for the sidelink may be started whenthe terminal receives the PDCCH, and the retransmission timer for thesidelink may be started in response to the expiration of the RTT timer.The RTT timer for the sidelink may be restarted when the terminaltransmits the PSSCH, and the retransmission timer for the sidelink maybe restarted in response to the expiration of the RTT timer.

Optionally, the first event may include: after the terminal transmits atleast one of the PSCCH or the PSSCH. Exemplarily, the state of the timerrelated to the DRX for the sidelink is controlled at a first time unitafter the terminal transmits at least one of the PSCCH or the PSSCH.

For example, the retransmission timer for the sidelink may be startedafter the terminal transmits at least one of the PSCCH or the PSSCH.

For another example, the RTT timer for the sidelink may be started afterterminal transmits at least one of the PSCCH or the PSSCH, and theretransmission timer for the sidelink may be started in response to theexpiration of the RTT timer.

For another example, the retransmission timer for the sidelink may bestarted after the terminal receives the PDCCH. The retransmission timerfor the sidelink may be restarted after the terminal transmits thePSCCH.

For another example, the RTT timer for the sidelink may be started afterthe terminal receives the PDCCH, and the retransmission timer for thesidelink may be started in response to the expiration of the RTT timer.The RTT timer for the sidelink may be restarted after the terminaltransmits the PSSCH, and the retransmission timer for the sidelink maybe restarted in response to the expiration of the RTT timer.

Optionally, in the embodiment of the disclosure, the first eventincludes may include the following operation.

The terminal receives a Physical Sidelink Feedback Channel (PSFCH).

Exemplarily, the first event may only include that the terminal receivesthe PSFCH. The first event may also include that the terminal receivesthe PDCCH, and that the terminal receives the PSFCH. The first event mayalso include that the terminal receives the PDCCH, that the terminaltransmits at least one of the PSCCH or the PSSCH, and that the terminalreceives the PSFCH.

Optionally, the first event may include: when the terminal receives thePSFCH.

For example, the retransmission timer for the sidelink may be startedwhen the terminal receives the PSFCH.

For another example, the RTT timer for the sidelink may be started whenthe terminal receives the PSFCH, and the retransmission timer for thesidelink may be started in response to the expiration of the RTT timer.

For another example, the retransmission timer for the sidelink may bestarted after the terminal receives the PDCCH. The retransmission timerfor the sidelink may be restarted when the terminal transmits the PSSCH.The retransmission timer for the sidelink may be restarted again whenthe terminal receives the PSFCH.

For another example, the RTT timer for the sidelink may be started afterthe terminal receives the PDCCH, and the retransmission timer for thesidelink may be started in response to the expiration of the RTT timer.The RTT timer for the sidelink may be restarted after the terminaltransmits the PSSCH, and the retransmission timer for the sidelink maybe started in response to the expiration of the RTT timer. The RTT timerfor the sidelink may be restarted again when the terminal receives thePSFCH, and the retransmission timer for the sidelink may be started inresponse to the expiration of the RTT timer.

Optionally, the first event may include: after the terminal receives thePSFCH. Exemplarily, the state of the timer related to the DRX for thesidelink may be controlled at a first time unit after the terminalreceives the PSFCH.

For example, the retransmission timer for the sidelink may be startedafter the terminal receives the PSFCH.

For another example, the RTT timer for the sidelink may be started afterthe terminal receives the PSFCH, and the retransmission timer for thesidelink may be started in response to the expiration of the RTT timer.

For another example, the retransmission timer for the sidelink may bestarted after the terminal receives the PDCCH. The retransmission timerfor the sidelink may be restarted after the terminal transmits thePSSCH. The retransmission timer for the sidelink may be restarted againafter the terminal receives the PSFCH.

For another example, the RTT timer for the sidelink may be started afterthe terminal receives the PDCCH, and the retransmission timer for thesidelink may be started in response to the expiration of the RTT timer.The RTT timer for the sidelink may be restarted after the terminaltransmits the PSSCH, and the retransmission timer for the sidelink maybe started in response to the expiration of the RTT timer. The RTT timerfor the sidelink may be restarted again after the terminal receives thePSFCH, and the retransmission timer for the sidelink may be started inresponse to the expiration of the RTT timer.

Optionally, in the embodiment of the disclosure, the first eventincludes:

The terminal transmits a Physical Uplink Control Channel (PUCCH).

Exemplarily, the first event may only include that the terminaltransmits the PUCCH. The first event may also include that the terminalreceives the PDCCH, and that the terminal transmits the PUCCH. The firstevent may also include that the terminal receives the PDCCH, that theterminal transmits at least of the PSCCH or the PSSCH, and that theterminal transmits the PUCCH. The first event may also include that theterminal receives the PDCCH, that the terminal transmits at least one ofthe PSCCH or the PSSCH, that the terminal receives the PSFCH, and thatthe terminal transmits the PUCCH.

Optionally, the first event may include: when the terminal transmits thePUCCH.

For example, the retransmission timer for the sidelink may be startedwhen the terminal transmits the PUCCH.

For another example, the RTT timer for the sidelink may be started whenthe terminal transmits the PUCCH, and the retransmission timer for thesidelink may be started in response to the expiration of the RTT timer.

For another example, the retransmission timer for the sidelink may bestarted when the terminal receives the PDCCH. The retransmission timerfor the sidelink may be restarted when the terminal transmits the PUCCH.

For another example, the retransmission timer for the sidelink may bestarted after the terminal receives the PDCCH. The retransmission timerfor the sidelink may be restarted when the terminal transmits the PSSCH.The retransmission timer for the sidelink may be restarted again afterthe terminal receives the PSFCH. The retransmission timer for thesidelink may be restarted when the terminal transmits the PUCCH.

Optionally, the first event may include: after the terminal transmitsthe PUCCH. Exemplarily, the state of the timer related to the DRX forthe sidelink may be controlled at a first time unit after the terminaltransmits the PUCCH.

For example, the retransmission timer for the sidelink may be startedafter the terminal transmits the PUCCH.

For another example, the RTT timer for the sidelink may be started afterthe terminal transmits the PUCCH, and the retransmission timer for thesidelink may be started in response to the expiration of the RTT timer.

For another example, the retransmission timer for the sidelink may bestarted after the terminal receives the PDCCH. The retransmission timerfor the sidelink may be restarted after the terminal transmits thePUCCH.

For another example, the retransmission timer for the sidelink may bestarted after the terminal receives the PDCCH. The retransmission timerfor the sidelink may be restarted after the terminal transmits thePSSCH. The retransmission timer for the sidelink may be restarted againafter the terminal receives the PSFCH. The retransmission timer for thesidelink may be restarted after the terminal transmits the PUCCH.

For another example, the RTT timer for the sidelink may be started afterthe terminal receives the PDCCH, and the retransmission timer for thesidelink may be started in response to the expiration of the RTT timer.The RTT timer for the sidelink may be restarted after the terminaltransmits the PSSCH, and the retransmission timer for the sidelink maybe started in response to the expiration of the RTT timer. The RTT timerfor the sidelink may be restarted again after the terminal receives thePSFCH, and the retransmission timer for the sidelink may be started inresponse to the expiration of the RTT timer. The RTT timer for thesidelink may be restarted again after the terminal transmits the PUCCH,and the retransmission timer for the sidelink may be started in responseto the expiration of the RTT timer.

Optionally, in the embodiment of the disclosure, the method is performedin at least one of the following conditions.

The PUCCH has been configured.

The PUCCH is not configured.

The PSFCH has been configured.

The PSFCH has been used.

The PSFCH is not configured.

The PSFCH is not used.

Optionally, in the embodiment of the disclosure, the first event has anassociation relationship with the conditions for performing the method.

In the embodiment of the disclosure, different events may correspond todifferent conditions for performing the method.

For example, the event is: after the terminal receives the PDCCH, andthe conditions may include at least one of the PUCCH not beingconfigured, the PSFCH not being configured or the PSFCH not being used.

For another example, the event is: after the terminal transmits at leastone of the PSCCH or the PSSCH, and the conditions may include at leastone of the PUCCH not being configured, the PSFCH not being configured orthe PSFCH not being used.

For another example, the event is: after the terminal receives thePSFCH, and the condition may include at least one of the PUCCH not beingconfigured, the PSFCH having been configured or the PSFCH having beenused.

For another example, the event is: after the terminal transmits thePUCCH, and the conditions may include at least one of the PUCCH havingbeen configured, the PSFCH having been configured, the PSFCH having beenused, the PSFCH not being configured or the PSFCH not being used.

In the embodiment of the disclosure, various correspondences between theevents and the conditions may also be set separately, and an event fortriggering the timer may be selected based on different executionconditions.

For example, the event is: after the terminal receives the PDCCH, and acorresponding condition is that the PUCCH is not configured and thePSFCH is not configured. The event is: after the terminal transmits atleast one of the PSCCH or the PSSCH, and a corresponding condition isthat the PUCCH has been configured and the PSFCH is not configured. Theevent is: after the terminal receives the PSFCH, and a correspondingcondition is that the PUCCH is not configured and PSFCH has beenconfigured. The event is: after the terminal transmits the PUCCH, and acorresponding condition is that PUCCH has been configured and PSFCH hasbeen configured.

For another example, the event is: after the terminal receives thePDCCH, and a corresponding condition is that the PUCCH is notconfigured, the PSFCH is not configured and the PSFCH is not used. Theevent is: after the terminal transmits at least one of the PSCCH or thePSSCH, and a corresponding condition is that the PUCCH has beenconfigured, the PSFCH is not configured and the PSFCH is not used. Theevent is: after the terminal receives the PSFCH, and a correspondingcondition is that the PUCCH is not configured, the PSFCH has beenconfigured and the PSFCH has been used. The event is: after the terminaltransmits the PUCCH, and a corresponding condition is that the PUCCH hasbeen configured, the PSFCH has been configured and the PSFCH is notused.

According to the embodiments of the disclosure, the state of the timerrelated to the DRX for the sidelink may be controlled based on theevents, so that the DRX may be optimized to reduce energy consumption ofthe terminal for sidelink transmission. For example, in a scenario wherethe terminal is configured as the mode-A and uses the DRX mechanism, theterminal may control the state of the timer related to the DRX for thesidelink based on some events after receiving the downlink informationfrom the network, thereby reducing the energy consumption of theterminal for the sidelink transmission.

In an application example, a time point of starting the timer in theembodiments of the disclosure may be a first time unit (symbol, slot, orthe like) after the event occurs. The event may be atransmitting/receiving behavior of a specific channel such as the PDCCH,the PSCCH, the PSSCH, the PSFCH, the PUCCH, or the like. When thechannel includes one or more time units, the timer may be started at thefirst or the last time unit of the channel.

The timer in the embodiments of the disclosure is introduced as follows.

The RTT timer: during operation of the timer, the UE does not need toperform downlink PDCCH reception, or does not need to perform thedownlink PDCCH reception for a specific HARQ process of the sidelink.

The retransmission timer: during operation of the timer, the UE needs toperform the downlink PDCCH reception, or needs to perform the downlinkPDCCH reception for a specific HARQ process of the sidelink.

First example: the timer is started according to the PDCCH. Referring toFIG. 5 , the example may include the following operations.

1. UE receives the PDCCH.

2. In a case that the PDCCH indicates resource grant of the sidelink,the timer related to the DRX is started, for example:

-   a) The RTT timer for the sidelink is started; and/or-   b) The retransmission timer (Re-Tx timer) for the sidelink is    started.

Specifically, manners of starting the timer may include at least one ofthe followings.

-   a) In a case that the RTT timer and the retransmission timer are    included, the retransmission timer for the sidelink is stopped, and    the retransmission timer for the sidelink is started in response to    the expiration of the RTT timer.-   b) In case that only the retransmission timer is included, the    running retransmission timer for the sidelink is stopped, and the    retransmission timer for the sidelink is restarted.

Optionally, whether to start the retransmission timer may be determinedbased on feedback information. One manner may include that whether tostart the retransmission timer for the sidelink is determined accordingto whether a UE at a reception side feeds back the ACK. If the ACK isfed back, the retransmission timer for the sidelink is not started.Otherwise, the retransmission timer for the sidelink is started. Anothermanner may include that whether to start the retransmission timer forthe sidelink is determined according to whether the UE at the receptionside feeds back information. If the information is fed back, theretransmission timer for the sidelink is started. Otherwise, theretransmission timer for the sidelink is not started.

Optionally, solution of the example may be used in at least one of thefollowing cases.

-   a) The PUCCH is not configured.-   b) The PSFCH is not configured.-   c) The PSFCH is not used.

Second example: the timer is started according to the PSCCH/PSSCH.Referring to FIG. 6 , the example may include the following operations.

1. The UE receives the PDCCH.

2. In a case that the PDCCH indicates the resource grant of thesidelink, the UE performs transmission of the PSCCH/PSSCH according tothe resource grant.

3. After the transmission of the PSCCH/PSSCH is performed, the timerrelated to the DRX is started, for example:

-   a) The RTT timer for the sidelink is started; and/or-   b) The retransmission timer for the sidelink is started.

Specifically, descriptions of manners of starting the timer may refer tothe first example.

Optionally, descriptions of determining whether to start theretransmission timer based on the feedback information may refer to thefirst example.

Optionally, solution of the example may be used in at least one of thefollowing cases.

-   a) The PUCCH is not configured.-   b) The PSFCH is not configured.-   c) The PSFCH is not used.

Third example: the timer is started according to the PSFCH. Referring toFIG. 7 , the example may include the following operations.

1. The UE receives the PDCCH.

2. If the PDCCH indicates the resource grant of the sidelink, the UEperforms the transmission of the PSCCH/PSSCH according to the resourcegrant.

3. The UE receives the PSFCH corresponding to the transmission of thePSCCH/PSSCH.

4. After the PSFCH is received, the timer related to the DRX is started,for example:

-   a) The RTT timer for the sidelink is started; and/or-   b) The retransmission timer for the sidelink is started.

Specifically, descriptions of manners of starting the timer may refer tothe first example.

Optionally, descriptions of determining whether to start theretransmission timer based on the feedback information may refer to thefirst example.

Optionally, solution of the example may be used in at least one of thefollowing cases:

-   a) The PUCCH is not configured.-   b) The PSFCH has been configured.-   c) The PSFCH has been used.

Fourth example: the timer is started according to the PUCCH. Referringto FIG. 8 , the example may include the following operations.

1. The UE receives the PDCCH.

2. If the PDCCH indicates the resource grant of the sidelink, the UEperforms the transmission of the PSCCH/PSSCH according to the resourcegrant.

3. The UE receives the PSFCH corresponding to the transmission ofPSCCH/PSSCH.

4. The UE reports the PUCCH.

5. After the PUCCH is reported, the timer related to the DRX is started,for example:

-   a) The RTT timer for the sidelink is started; and/or-   b) The retransmission timer for the sidelink is started.

Specifically, descriptions of manners of starting the timer may refer tothe first example.

Optionally, descriptions of determining whether to start theretransmission timer based on the feedback information may refer to thefirst example.

Optionally, solution of the example may be used in at least one of thefollowing cases:

-   a) The PUCCH has been configured.-   b) The PSFCH has been configured.-   c) The PSFCH has been used.-   d) The PSFCH is not configured.-   e) The PSFCH is not used.

Furthermore, solutions of the first to fourth examples may be combined.

For example, the UE starts at least one of the RTT timer or theretransmission timer based on the event of the first example. Then, theUE starts at least one of the RTT timer or the retransmission timerbased on at least one event of the second example, the third example orthe fourth example. Manners of restarting at least one of the RTT timeror the retransmission timer may include: (1) when a RTT timer is runningat this time: if the RTT timer needs to be started, the running RTTtimer is restarted, and if the retransmission timer needs to be started,the retransmission timer is started after the expiration of the currentRTT timer. (2) when the retransmission timer is running at this time: ifthe retransmission timer needs to be started, the retransmission timeris restarted.

For another example, the UE starts at least one of the RTT timer or theretransmission timer based on the event of the second example. Then, theUE starts at least one of the RTT timer or the retransmission timerbased on at least one event of the first example, the third example orthe fourth example. Manners of restarting at least one of the RTT timeror the retransmission timer may refer to related descriptions of theabove examples.

For another example, the UE starts at least one of the RTT timer or theretransmission timer based on the event of the third example. Then, theUE starts at least one of the RTT timer or the retransmission timerbased on at least one event of the first example, the second example orthe fourth example. Manners of restarting at least one of the RTT timeror the retransmission timer may refer to related descriptions of theabove examples.

For another example, the UE starts at least one of the RTT timer or theretransmission timer based on the event of the fourth example. Then, theUE starts at least the RTT timer or the retransmission timer based on atleast one event of the first example, the second example or the thirdexample. Manners of restarting at least one of the RTT timer or theretransmission timer may refer to related descriptions of the aboveexamples.

According to the embodiments of the disclosure, a power saving mechanismof the sidelink is optimized, so that a power saving effect may still beachieved on downlink reception in case that the network schedules theresources of the sidelink.

FIG. 9 is a block diagram of a terminal 400 according to an embodimentof the disclosure. The terminal 400 may include a reception unit 410 anda processing unit 420.

The reception unit 410 is configured to receive downlink information.The downlink information is configured to indicate resource grant of asidelink.

The processing unit 420 is configured to control a state of a timerrelated to DRX for the sidelink based on a first event.

Optionally, in the embodiment of the disclosure, the downlinkinformation is carried by a PDCCH.

Optionally, in the embodiment of the disclosure, the timer related tothe DRX includes at least one of a RTT timer or a retransmission timer.

Optionally, in the embodiment of the disclosure, the processing unit isfurther configured to perform at least one of the following operations.

A RTT timer for the sidelink is started.

A retransmission timer for the sidelink is started in response toexpiration of the RTT timer.

Optionally, in the embodiment of the disclosure, the processing unit isfurther configured to start the retransmission timer for the sidelink.

Optionally, in the embodiment of the disclosure, the processing unit isfurther configured to determine whether to start the retransmissiontimer for the sidelink based on feedback information.

Optionally, in the embodiment of the disclosure, the processing unit isfurther configured to perform at least one of the following operations.

The retransmission timer for the sidelink is not started, in response tothe feedback information being ACK information.

The retransmission timer for the sidelink is started, in response to thefeedback information being NACK information.

The retransmission timer for the sidelink is started, in response toreception of the feedback information.

The retransmission timer for the sidelink is not started, in response tono reception of the feedback information.

Optionally, in the embodiment of the disclosure, the processing unit isfurther configured to stop a running retransmission timer for thesidelink.

Optionally, in the embodiment of the disclosure, the first event mayinclude the following.

After the terminal receives a PDCCH including the downlink information.

Optionally, in the embodiment of the disclosure, the first event mayinclude the following.

After the terminal transmits at least one of a PSCCH or a PSSCH.

Optionally, in the embodiment of the disclosure, the first event mayinclude the following.

After the terminal receives a PSFCH.

Optionally, in the embodiment of the disclosure, the first event mayinclude the following.

After the terminal transmits a PUCCH.

Optionally, in the embodiment of the disclosure, the processing unit ofthe terminal is run in at least one of the following conditions.

The PUCCH has been configured.

The PUCCH is not configured.

The PSFCH has been configured.

The PSFCH has been used.

The PSFCH is not configured.

The PSFCH is not used.

Optionally, in the embodiment of the disclosure, the first event has anassociation relationship with the condition of the processing unit ofthe terminal.

The terminal 400 of the embodiments of the disclosure may implementcorresponding functions of the terminal in the foregoing methodembodiment. Processes, functions, implementations and beneficial effectscorresponding to modules (sub-modules, units, or components, or thelike) of the terminal 400 may refer to corresponding descriptions in theforegoing embodiments of the method 200, and would not be elaboratedhere. It should be noted that the functions described with respect tothe modules (sub-modules, units, or components, or the like) of theterminal 400 of the embodiments of the disclosure may be implemented bydifferent modules (sub-modules, units, or components, or the like), ormay be implemented by the same module (sub-module, unit, or component,or the like).

FIG. 10 is a structural diagram of a communication device 600 accordingto an embodiment of the disclosure. The communication device 600includes a processor 610 which may call and run a computer program froma memory to enable the communication device 600 to implement the methodsof the embodiments of the disclosure.

Optionally, the communication device 600 may further include a memory620. The processor 610 may call and run a computer program from thememory 620 to enable the communication device 600 to implement themethods of the embodiments of the disclosure.

The memory 620 may be a separate device independent of the processor610, or may be integrated into the processor 610.

Optionally, the communication device 600 may further include atransceiver 630. The processor 610 may control the transceiver 630 tocommunicate with other devices, specifically, to transmit information ordata to other devices, or to receive information or data from otherdevices.

The transceiver 630 may include a transmitter and a receiver. Thetransceiver 630 may further include antennas, and a number of antennasmay be one or more.

Optionally, the communication device 600 may be the terminal of theembodiments of the disclosure, and the communication device 600 mayimplement corresponding processes implemented by the terminal in variousmethods of the embodiments of the disclosure, which would not beelaborated here for brevity.

FIG. 11 is a structural diagram of a chip 700 according to an embodimentof the disclosure. The chip 700 includes a processor 710 which may calland run a computer program from a memory to implement the methods of theembodiments of the disclosure.

Optionally, the chip 700 may further include a memory 720. The processor710 may call and run a computer program from the memory 720 to implementthe methods performed by the terminal of the embodiments of thedisclosure.

The memory 720 may be a separate device independent of the processor710, or may be integrated into the processor 710.

Optionally, the chip 700 may further include an input interface 730. Theprocessor 710 may control the input interface 730 to communicate withother devices or chips, specifically, to obtain information or data fromother devices or chips.

Optionally, the chip 700 may further include an output interface 740.The processor 710 may control the output interface 740 to communicatewith other devices or chips, specifically, to output information or datato other devices or chips.

Optionally, the chip may be applied to the terminal in the embodimentsof the disclosure, and the chip may implement corresponding processesimplemented by the terminal in various methods of the embodiments of thedisclosure, which would not be elaborated here for brevity.

It should be understood that the chip mentioned in the embodiment of thedisclosure may also be referred to as a system-level chip, a systemchip, a chip system, an on-chip system chip, or the like.

The processor as mentioned above may be a general-purpose processor, aDigital Signal Processor (DSP), a Field Programmable Gate Array (FPGA),an Application Specific Integrated Circuit (ASIC), or other programmablelogical devices, a transistor logical device, a discrete hardwarecomponent, or the like. The general-purpose processor as mentioned abovemay be a microprocessor, or may be any conventional processor, or thelike.

The memory as mentioned above may be a volatile memory or a non-volatilememory, or may include both the volatile and non-volatile memories. Thenon-volatile memory may be a Read-Only Memory (ROM), a Programmable ROM(PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM), or aflash memory. The volatile memory may be a Random Access Memory (RAM).

It should be understood that the memory as mentioned above isillustrative rather than restrictive. For example, the memory in theembodiments of the disclosure may also be a Static RAM (SRAM), a DynamicRAM (DRAM), a Synchronous DRAM (SDRAM), a Double Data Rate SDRAM (DDRSDRAM), an Enhanced SDRAM (ESDRAM), a Synch Link DRAM (SLDRAM), a DirectRambus RAM (DR RAM), or the like. That is, the memory in the embodimentsof the disclosure is intended to include, but is not limited to,memories of these and any other proper types.

FIG. 12 is a block diagram of a communication system 800 according to anembodiment of the disclosure. The communication system 800 includes aterminal device 810, a terminal device 820 and a network device 830.

The terminal device 810 is configured to receive downlink informationwhich is configured to indicate resource grant of a sidelink, andcontrol a state of a timer related to DRX for the sidelink based on afirst event.

The terminal device 820 is configured to perform sidelink communicationwith the terminal device 810.

The network device 830 is configured to transmit the downlinkinformation.

The terminal device 810 is configured to implement correspondingfunctions implemented by the terminal at the transmission side in theforegoing methods. The terminal device 820 is configured to implementcorresponding functions implemented by the terminal at the receptionside in the foregoing methods. The network device 830 is configured toimplement corresponding functions implemented by the network device inthe foregoing methods. Details are not elaborated here for brevity.

All or part of the foregoing embodiments may be implemented by software,hardware, firmware, or any combination thereof. When implemented byusing software, all or part of the foregoing embodiments may beimplemented in a form of a computer program product. The computerprogram product includes one or more computer instructions. When thecomputer program instructions are loaded and executed on a computer, allor part of the processes or functions according to the embodiments ofthe disclosure are generated. The computer may be a general-purposecomputer, a special purpose computer, a computer network, or anotherprogrammable device. The computer instructions may be stored in acomputer-readable storage medium or transmitted from onecomputer-readable storage medium to another computer-readable storagemedium. For example, the computer instructions may be transmitted fromone website site, computer, server or data center to another websitesite, computer, server or data center in a wired (e.g., coaxial cable,optical fiber, Digital Subscriber Line (DSL)) or wireless (e.g.,infrared, wireless, microwave, or the like) manner. Thecomputer-readable storage medium may be any available medium accessibleby a computer, or a data storage device integrated with one or moreavailable media, such as a server or a data center. The available mediummay be a magnetic medium (such as a floppy disk, a hard disk, or amagnetic tape), an optical medium (such as a Digital Versatile Disk(DVD)), or a semiconductor medium (such as a Solid State Disk (SSD)), orthe like.

It should be understood that in various embodiments of the disclosure,size of a serial number of each process does not indicate an executionsequence of each process, and the execution sequence of each processshould be determined by its function and internal logic, and should notform any limitation on implementation processes of the embodiments ofthe disclosure.

It should be clearly understood by those skilled in the art that forconvenience and brevity of descriptions, specific working processes ofthe system, device and unit as mentioned above may refer tocorresponding processes in the foregoing method embodiments, which arenot elaborated here.

The foregoing are only specific embodiments of the disclosure, however,the scope of protection of the disclosure is not limited thereto.Variation and substitution which may be readily conceived by thoseskilled in the art within the technical scope disclosed in thedisclosure should fall within the scope of protection of the disclosure.Therefore, the scope of protection of the disclosure should conform tothe scope of protection of the claims.

1. A sidelink transmission method, comprising: receiving, by a terminal,downlink information, wherein the downlink information is configured toindicate resource grant of a sidelink; and controlling, by the terminal,a state of a timer related to discontinuous reception (DRX) for thesidelink based on a first event.
 2. The method of claim 1, wherein thedownlink information is carried by a Physical Downlink Control Channel(PDCCH).
 3. The method of claim 1, wherein the timer related to the DRXcomprises at least one of a round-trip time (RTT) timer or aretransmission timer.
 4. The method of claim 3, wherein controlling thestate of the timer related to the DRX for the sidelink comprises atleast one of following operations: starting the RTT timer for thesidelink; or in response to expiration of the RTT timer, starting theretransmission timer for the sidelink.
 5. The method of claim 3, whereincontrolling the state of the timer related to the DRX for the sidelinkcomprises: starting the retransmission timer for the sidelink. 6-8.(canceled)
 9. The method of claim 1, wherein the first event comprises:receiving, by the terminal, a PDCCH comprising the downlink information.10. The method of claim 1, wherein the first event comprises:transmitting, by the terminal, a Physical Sidelink Shared Channel(PSSCH).
 11. (canceled)
 12. The method of claim 1, wherein the firstevent comprises: transmitting, by the terminal, a Physical UplinkControl Channel (PUCCH).
 13. The method of claim 12, wherein the methodis performed in at least one of following conditions: the PUCCH havingbeen configured; or the PUCCH not being configured.
 14. The method ofclaim 13, wherein the first event has an association relationship withthe conditions for performing the method.
 15. A terminal, comprising: atransceiver, configured to receive downlink information, wherein thedownlink information is configured to indicate resource grant of asidelink; and a processor, configured to control a state of a timerrelated to discontinuous reception (DRX) for the sidelink based on afirst event.
 16. The terminal of claim 15, wherein the downlinkinformation is carried by a Physical Downlink Control Channel (PDCCH).17. The terminal of claim 15, wherein the timer related to the DRXcomprises at least one of a round-trip time (RTT) timer or aretransmission timer.
 18. The terminal of claim 17, wherein theprocessor is further configured to perform at least one of followingoperations: starting the RTT timer for the sidelink; or in response toexpiration of the RTT timer, starting the retransmission timer for thesidelink. 19-22. (canceled)
 23. The terminal of claim 15, wherein thefirst event comprises: receiving, by the terminal, a PDCCH comprisingthe downlink information.
 24. The terminal of claim 15, wherein thefirst event comprises: transmitting, by the terminal, a PhysicalSidelink Shared Channel (PSSCH).
 25. (canceled)
 26. The terminal ofclaim 15, wherein the first event comprises: transmitting, by theterminal, a Physical Uplink Control Channel (PUCCH).
 27. The terminal ofclaim 26, wherein the processor of the terminal is activated in at leastone of following conditions: the PUCCH having been configured; or thePUCCH not being configured.
 28. The terminal of claim 27, wherein thefirst event has an association relationship with the conditions foractivating the processor of the terminal. 29-30. (canceled)
 31. Anon-transitory computer-readable storage medium, having stored thereon acomputer program which enables a computer to: receive downlinkinformation, wherein the downlink information is configured to indicateresource grant of a sidelink; and control a state of a timer related todiscontinuous reception (DRX) for the sidelink based on a first event.32-33. (canceled)